Nowadays, the smartphone market has gained high user
acceptance along with a growing demand for high quality mobile services,
including high-speed internet and clear voice calls. The indoor usage
represents the lion’s share of all generated mobile traffic with a percentage
of roughly 90% according to Femto Forum [1] and Huawei Technologies [2].
Unfortunately, indoor communications experience severe
signal degradation due to penetration through walls and different obstacles,
making the mobile coverage weaker inside. Femtocell is a new business use case
that has aroused a huge interest among operators, the basic idea behind that is
reusing the same spectral resources inside and outside. This concept has been
proposed in the objective of strengthening indoor signals to provide mobile
coverage expansion within buildings as well as mobile traffic offloading for
band saturation problems. However, large femtocell deployments may lead to harmful
interference either to nearby femtocells or external macrocells since the same
frequency band is used inside and outside.
Implementing femtocells over TV white spaces may guarantee
an interference-free environment and reduce the booming spectrum demands to
support the commercial bands already exhausted. Regarding the good penetration
of TV wavelengths, a single TVWS femtocell can cover more dead zones and more
buildings while reducing energy consumption and thus more cost savings. TV
white spaces have a larger bandwidth allowing for higher throughputs. Another attractive
application for TVWS femtocells could be ensuring backhauls for WIFI access
points to avoid the need for wiring.
BIBLIOGRAPHY
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